Alpha-MnO2 catalyst with high formaldehyde oxidation and moisture resistance by joint cerium modification and phosphoric acid post-treatment

文献类型： 外文期刊

第一作者： Chen, Tian-Yun

作者： Chen, Tian-Yun;Liu, Yang;Zhan, Jingjing;Zhou, Hao;Yi, Xianliang;Li, Zhonghong;Shen, Xudong

作者机构：

关键词： Indoor air; Formaldehyde; Catalytic oxidation; Moisture resistance; Manganese oxide

期刊名称：ENVIRONMENTAL RESEARCH （ 影响因子：7.7； 五年影响因子：7.7 ）

ISSN： 0013-9351

年卷期： 2025 年 279 卷

页码：

收录情况： SCI

摘要： Moisture is one prevalent interfering component during toxic formaldehyde treatment. Herein, Ce0.2Mn-P was synthesized through Ce incorporation and H3PO4 post-treatment, thereby enhancing the activity and water tolerance of alpha-MnO2. Removal efficiencies for similar to 315 mg/m(3) formaldehyde are similar to 52 %, similar to 54 %, similar to 88 % and similar to 85 % over MnO2, MnO2-P, Ce0.2Mn and Ce0.2Mn-P, respectively. Various analyses have shown that Ce modification is the primary factor enhancing catalytic oxidation. Besides, under two humidities (1.8 and 3.0 vol%), the inactivation rate of Ce0.2Mn-P is below 20 %, which was much lower than that of MnO2-P and Ce0.2Mn. Obviously, the enhancement of the moisture resistance of the catalyst is attributed to the joint action of Ce modification and H3PO4 post-treatment. XRD, isothermal N-2 adsorption-desorption, SEM, mapping, (HR)TEM, Raman, ATR, DRS, XPS, CO-TPR, O-2-TPD, O-2-TPO, water contact angle, H2O-TPD are performed for characterizations. Ce modification populates surface hydroxyls, which play a crucial role in the complete oxidation of formaldehyde. In addition, Ce modification and H3PO4 pretreatment can not only suppress the adsorption of water on the catalyst surface but also mitigate the impact of water on the polarity of the Mn-O bond. which is conducive to the improvement of the moisture resistance of the catalyst.

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